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tools/nolibc: add fopen()

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This is used in various selftests and will be handy when integrating
those with nolibc.

Only the standard POSIX modes are supported.
No extensions nor the (noop) "b" from ISO C are accepted.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-13-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh
2025-05-21 15:32:14 +02:00
committed by Thomas Weißschuh
parent 256dc7339d
commit a009a0c6fa
2 changed files with 51 additions and 0 deletions
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tools/include/nolibc/stdio.h
+27
View File
@@ -13,6 +13,7 @@
#include "std.h"
#include "arch.h"
#include "errno.h"
#include "fcntl.h"
#include "types.h"
#include "sys.h"
#include "stdarg.h"
@@ -55,6 +56,32 @@ FILE *fdopen(int fd, const char *mode __attribute__((unused)))
return (FILE*)(intptr_t)~fd;
}
static __attribute__((unused))
FILE *fopen(const char *pathname, const char *mode)
{
int flags, fd;
switch (*mode) {
case 'r':
flags = O_RDONLY;
break;
case 'w':
flags = O_WRONLY | O_CREAT | O_TRUNC;
break;
case 'a':
flags = O_WRONLY | O_CREAT | O_APPEND;
break;
default:
SET_ERRNO(EINVAL); return NULL;
}
if (mode[1] == '+')
flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
fd = open(pathname, flags, 0666);
return fdopen(fd, mode);
}
/* provides the fd of stream. */
static __attribute__((unused))
int fileno(FILE *stream)
tools/testing/selftests/nolibc/nolibc-test.c
+24
View File
@@ -859,6 +859,29 @@ int test_getpagesize(void)
return !c;
}
int test_file_stream(void)
{
FILE *f;
int r;
f = fopen("/dev/null", "r");
if (!f)
return -1;
errno = 0;
r = fwrite("foo", 1, 3, f);
if (r != 0 || errno != EBADF) {
fclose(f);
return -1;
}
r = fclose(f);
if (r == EOF)
return -1;
return 0;
}
int test_fork(void)
{
int status;
@@ -1311,6 +1334,7 @@ int run_syscall(int min, int max)
CASE_TEST(dup3_0); tmp = dup3(0, 100, 0); EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
CASE_TEST(dup3_m1); tmp = dup3(-1, 100, 0); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
CASE_TEST(execve_root); EXPECT_SYSER(1, execve("/", (char*[]){ [0] = "/", [1] = NULL }, NULL), -1, EACCES); break;
CASE_TEST(file_stream); EXPECT_SYSZR(1, test_file_stream()); break;
CASE_TEST(fork); EXPECT_SYSZR(1, test_fork()); break;
CASE_TEST(getdents64_root); EXPECT_SYSNE(1, test_getdents64("/"), -1); break;
CASE_TEST(getdents64_null); EXPECT_SYSER(1, test_getdents64("/dev/null"), -1, ENOTDIR); break;